<?php/** * Smarty plugin * @package Smarty * @subpackage plugins *//** * Smarty {math} function plugin * * Type:     function<br> * Name:     math<br> * Purpose:  handle math computations in template<br> * @link http://smarty.php.net/manual/en/language.function.math.php {math} *          (Smarty online manual) * @param array * @param Smarty * @return string */function smarty_function_math($params, &$smarty){    // be sure equation parameter is present    if (empty($params['equation'])) {        $smarty->trigger_error("math: missing equation parameter");        return;    }    $equation = $params['equation'];    // make sure parenthesis are balanced    if (substr_count($equation,"(") != substr_count($equation,")")) {        $smarty->trigger_error("math: unbalanced parenthesis");        return;    }    // match all vars in equation, make sure all are passed    preg_match_all("!\!(0x)([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match);    $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',                           'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');    foreach($match[2] as $curr_var) {        if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {            $smarty->trigger_error("math: parameter $curr_var not passed as argument");            return;        }    }    foreach($params as $key => $val) {        if ($key != "equation" && $key != "format" && $key != "assign") {            // make sure value is not empty            if (strlen($val)==0) {                $smarty->trigger_error("math: parameter $key is empty");                return;            }            if (!is_numeric($val)) {                $smarty->trigger_error("math: parameter $key: is not numeric");                return;            }            $equation = preg_replace("/\b$key\b/",$val, $equation);        }    }    eval("\$smarty_math_result = ".$equation.";");    if (empty($params['format'])) {        if (empty($params['assign'])) {            return $smarty_math_result;        } else {            $smarty->assign($params['assign'],$smarty_math_result);        }    } else {        if (empty($params['assign'])){            printf($params['format'],$smarty_math_result);        } else {            $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));        }    }}/* vim: set expandtab: */?>